Don’t target anything in your practice. You shouldn’t target what you want to see in Vipassana practice. Whatever happens, stay with the experience. Your responsibility is to maintain the awareness – have right view and continue to be aware.
How long? From the time you wake up till the time you sleep. It is very important that you don’t set a target for what you want to see. When you have a target, the mind starts to imagine this, and you cannot see as it is. We want to know nature as it is.
You should not think about the future – e.g. ‘I want to sit for an hour and not move.’ Whatever happens, your responsibility is to be aware of the present moment; any situation, any time. That’s all.